Carbon canisters filter hydrocarbons out of fumes vented duringthermal expansion and/or refueling of tanks. Canisters are thenpurged when fresh air is drawn into the tank during thermalcontraction or while the engine is running.

ICVs are used to help prevent wellback (the reverse flowof fuel out the fill after refueling is completed) & spitback.These normally closed valves are opened by the presenceof fuel running down the fill pipe during refueling.

Overview

Perko has been manufacturing fuel system components since 1936 when we introduced our first fuel filter. Since then we have manufactured various types of fuel filters, fuel water separators, fuel system vents, fuel fills and caps and the fuel system product we are best known for, our combination fill vent.

Now we have expanded our line to help boat builders properly and safely comply with new diurnal emissions regulations. Our expanded line now includes carbon canisters and specialized fuel system valves.

To assure safe, competitive quality components, we have partnered with experienced automotive suppliers of these components with proven records of design and quality. Together we have worked to tailor their proven designs to best fit the needs of boat builders.

Delphi has been manufacturing automotive carbon canisters for over 40 years. Raval has been manufacturing tank vent valves for over 10 years. Both work to automotive quality standards for fuel systems. With these new partners, we are working to provide boat builders with the right solution to reduce diurnal emissions for each model boat they build.

Latest Press Release

Perko Guides Replacement Gas Cap Choices

November 17, 2014 9:51 am

During the heat of the day, a boat's fuel tank can warm and the liquid within it expand. This built-up pressure used to be vented off through fittings. But in 2011, the US Environmental Protection Agency (EPA) mandated that fuel systems on new boats be sealed to protect air quality from hydrocarbon emissions. Perko has responded with its full line of EPA-compliant, replacement sealed gas caps with built-in vacuum over pressure relief (VOPR), each proudly made in the USA.

Whether it falls overboard at the fuel dock or has simply lost its lustrous shine, it's important for boat owners to know what type of system they have to correctly select the proper cap. The company's packaging makes selecting the right model easy: blue is for pre-2011 vented systems and green is for post-2011 sealed designs.

Using the wrong cap can be dangerous to both the boater and the environment. A sealed version on a vented system may cause a tank to over-pressurize and create...